Honeycombs testing

First, the activity of base metal honeycombs tested for CO oxidation was good with the temperature of 50% conversion at 80,000/hr space velocity being about 260°C after aging 16 hrs at 815°C. This is comparable to the activity of honeycombs containing Pt that are presently being used. 

EN 2243-03 Peeling Test Metal-to-Honeycomb Test Method. 

The modern Russian MIA flaw detectors use pulse version of the method [1-3], which peirnits to produce very portable (0.7 - 1.5 kg) and simple instruments, convenient especially for in-service testing. The objects to be tested are multilayer structures of reinforced plastics, metals and other materials honeycomb panels, antenna fairings, propellers, helicopter rotors and so on. In mentioned instruments amplitude-frequency analog signal processing is used. 

In testing materials with high sound damping, the burst transmitter increases the signal-to-noise ratio to, typically, 12 dB. Typical applications honeycomb and concrete components, and air-coupled testing. 

Table 1 contains the metal-to-metal engineering property requirements for Boeing Material Specification (BMS) 5-101, a structural film adhesive for metal to metal and honeycomb sandwich use in areas with normal temperature exposure. The requirements are dominated by shear strength tests. Shear strength is the most critical engineering property for structural adhesives, at least for the simplistic joint analysis that is commonly used for metal-to-metal secondary structure on commercial aircraft. Adhesive Joints are purposefully loaded primarily in shear as opposed to tension or peel modes as adhesives are typically stronger in shear than in Mode I (load normal to the plane of the bond) loading. 

In addition to developing solid RP structures, work has been conducted on sandwich structures such as filament-wound plastic skins with low-density foamed core or a plastic honeycomb core to develop more efficient strength-to-weight structures. Sandwich structures using a syntactic core have been successfully tested so that failures occurred at prescribed high-hydrostatic pressures of 28 MPa (4,000 psi). 

Axial and swirling air streams in the combustor issued from a circular chamber through a conical nozzle. The chamber was utilized both as an acoustic resonator and a settling chamber. It contained a honeycomb to straighten the how and two acoustic drivers to apply acoustic excitation to the jet. The nozzle exit diameter was 3.8 cm and the maximum Reynolds number based on this diameter and the exit velocity with and without air forcing was 4800 and 1400, respectively. The tests were performed with total air how rate of 85 1/min, and fuel how rate of 0.063 1/min. The swirl was applied with tangential air injection and the maximum swirl number tested was Ns = 0.30. 

In the second configuration (moderate swirl) tested (see Fig. 20.2a), only the air stream was forced and no liquid-fuel pulsations were imposed. The experiments were performed with a Parker-Hannifan Research Simplex Atomizer. The atomizing nozzle consisted of a primary liquid ethanol feed with a coaxial primary air stream. The air stream passed through a set honeycomb, flow-straightener, and swirl vanes to provide the necessary level of swirl. Three loudspeakers were used to excite the primary air. 

In subsequent stages validation experiments were performed over monolith catalyst samples at two different scales (i) monolith core samples (up to 10 cm3) in a laboratory rig for integral reactor experiments and (ii) full-scale honeycomb monoliths (up to 43 L in size) in engine test bench runs. 

Single crystals of /S-A1203 are essentially two dimensional conductors. The conducting plane has hexagonal symmetry (honeycomb lattice). This characteristic feature made -alumina a useful model substance for testing atomistic transport theory, for example with the aid of computer simulations. Low dimensionality and high symmetry reduce the computing time of the simulations considerably (e.g., for the calculation of correlation factors of solid solutions). 

PM2 5 PM10 PMA PMC PNA Pour point Particulate matter less than 2.5 ptm and 10 jam in diameter. Polymetacrylate viscosity index improver or viscosity modifier. Pensky-Martin closed cup-flash point test. Polynuclear aromatic. Measure of lubricant low-temperature flow which is 3°C above the temperature at which a normally liquid petroleum product maintains fluidity. Oil forms a honeycomb or crystals at low... 

To overcome this challenge, other filter designs and construction materials were tested, such as packed-bed filters [41], foam ceramic filters [39, 42—44], sintered ceramic filters [18, 45, 46], candle-type filters made from metal or ceramics [22, 47], or honeycomb structures made from steel [48]. Among the construction materials, the performance of high-temperature ceramics, such as SiC, Zr02, or SiC>2, was investigated [18, 45, 46, 49],... 

A common example of a proof test is to apply a cleavage load to a bonded honeycomb sandwich by placing an instrument between the face and core and applying a predetermined force perpendicular to the core. If there is no bond disruption due to this test, it is supposed that the product will meet all its service requirements. Other common proof tests used with sealants are leak-testing with a mobile and easily detected gas such as helium or by the application of hydrostatic pressures. 

A similar specimen design uses a sandwich construction with a dissimilar material bonded between the two cylindrical halves of the button specimen. This design is commonly used to measure the tensile strength of adhesives between dissimilar materials or if the adherend does not have the strength or characteristics to be machined into the shape of the button specimen. With some modifications in the dimensions, the button tensile test has also been adapted for testing adherence of honeycomb-cover sheets to the core (ASTM C 297). 

E 229 E 864 Test Method for Shear Strength and Shear Modulus of Structural Adhesives Practice for Surface Preparation of Aluminum Alloys to be Adhesively Bonded in Honeycomb Shelter Panels... 

Ham et al. (99) have studied the effect of S02 in the temperature range 523-723K. Below 573 K a decrease of activity by 60% at 523 K and 20% at 573 K occurs, while above 573 K no inhibition was observed. During the tests at low temperature with S02, accumulation of ammonium sulfate and/or ammonium bisulfate occurs and may cause severe blocking. At higher temperatures these salts decompose and this may explain the absence of inhibition. Complete regeneration of deactivated catalysts can be achieved by heat treatment at 773 K. Over Cu-H-MOR bound with silica and deposited on a cordierite honeycomb, only 12% decrease of NO conversion was observed at 673 K after 350 h passivation in presence of 200... 

Figure 3 (a) Front view of the first solar water-splitting receiver-reactor, (b) Small-scale honeycomb coated with redox material (black) in the centre of the reactor ready for testing. 

The honeycomb monoliths were dried at room temperature and then heated in air to 150°C for 4h. Samples of each composite were also heat-treated at 500°C or 850°C in nitrogen. Heat-treatment in an inert atmosphere was necessary to avoid oxidation of the AC. These materials were subsequently used in all of the characterisation techniques and adsorption performance tests. 

The adsorbent with HISIV 10(X) adsorbed more toluene and cyclohexanone than that with HISIV 3000. HISIV 3000 was efficient to adsorb MEK than HISIV 10(X). In order to adsorb all 3 types of target VOC s efficiently, honeycomb adsorbent with mixed zeolites was made and tested. As expected, 9.72% toluene, 11.0% MEK, 13.0% cyclohexanone were adsorbed to the adsorbrat until the concentration of VOC in effluent gas reached 40 ppniv. VOC removal efficiency of the mixed zeolite impregnated honycomb with repect to toluene, MEK, cyclohexanone were 98.2,99,1,96.7 %, repectively. 

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